Source details

There is not an proper image/source credit, but based on the previous & next build (10.0.10523.1055.th2_xbox_rel_1508.150919-2100 -> 10.0.10523.1059.th2_xbox_rel_1508.150923-2100), this revision is 1058 (https://www.reddit.com/r/xboxone/comments/3mt6d5/2nd_wave_of_nxoe_available_i_just_got_a_1gb_update/cvix28x)